<template>
	<view>
		<view class="search-box">
		  <uni-search-bar :radius="100" @input="input" cancelButton="none" :focus="true"></uni-search-bar>
		</view>
    <!-- 建议列表部分 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item.goods_id)">
        <view class="goods-name">{{ item.goods_name }}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史记录 -->
    <view class="history-box" v-else>
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clearHistory"></uni-icons>
      </view>
      <view class="history-list">
        <uni-tag :text="item" v-for="(item, i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
  
</template>

<script>
	export default {
		data() {
			return {
        // 防抖定时器
				timer: null,
        // 输入框的值
        kw: '',
        // 搜索建议数据列表
        searchResults: [],
        // 搜索历史
        historyList: []
			};
		},
    onLoad () {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    computed: {
      historys () {
        return [...this.historyList].reverse()
      }
    },
    methods: {
      input (e) {
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          this.kw = e
          this.getSearchList()
        }, 500)
      },
      // 获取搜索建议列表数据
      async getSearchList () {
        if(this.kw.length === 0) {
          this.searchResults = []
          return
        }
        const { data: res } = await uni.$http.get('/goods/qsearch',{
          query: this.kw
        })
        if(res.meta.status !== 200) return uni.$showMsg('获取搜索建议列表失败')
        this.searchResults = res.message
        this.saveSearchHistory()
      },
      // 监听建议列表的点击事件
      gotoDetail (id) {
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id=' + id
        })
      },
      // 保存搜索历史
      saveSearchHistory () {
        // this.historyList.push(this.kw)
        var set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)
        uni.setStorageSync('kw', JSON.stringify(this.historyList))
      },
      // 清空搜索历史记录
      clearHistory () {
        this.historyList = []
        uni.removeStorageSync('kw')
      },
      // 搜索历史的点击事件
      gotoGoodsList (kw) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    }
	}
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 9999;
}
.sugg-list {
  padding: 0 5px;
  .sugg-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    .goods-name {
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}
.history-box {
  padding: 0 5px;

  .history-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }

  .history-list {
    display: flex;
    flex-wrap: wrap;

    .uni-tag {
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}

</style>
